Color

#1b00a3

#1b00a3
hex#1b00a3
rgbrgb(27, 0, 163)
hslhsl(250, 100%, 32%)
oklchoklch(0.333 0.218 270.1)
Closest name: Cobalt (#030aa7)Relative luminance 0.0288

Tints & shades

Every swatch is its own page — click any to analyze it.

Harmonies

Complementary

Open in tool →

#88a300

#0036a3 · #6d00a3

#a31b00 · #00a31b

Split-complementary

Open in tool →

#a36d00 · #36a300

#a30036 · #88a300 · #00a36d

Contrast

#1b00a3 as textRatioAAAA largeAAAFix
Aaon white
13.33:1passpasspassPasses AAA — no fix needed.
Aaon black
1.58:1failfailfail
  • AA: use #7357ff as the text (4.54:1)
  • AAA: use #9985ff as the text (7.15:1)
  • AA: or shift the background to #969696 (4.51:1)
  • AAA: or shift the background to #bdbdbd (7.09:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #1b00a3 as the background.

Brands using this color

No public brand in the corpus uses this exact color yet. Extract a brand to add one.

Fonts for this mood

#1b00a3 reads as cool, vivid, technical. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #1b00a3
live endpoint

Point any MCP client at the shared colors endpoint and your agent gets the same engine as this page — generate_palette, check_contrast, analyze_color — read-only, no key. Every palette it proposes comes with a /palettes/new/… link: open it, lock what you like, paste the link back.

endpointhttps://mcp.brandsweets.com/colors/mcp
claude mcp add --transport http brandsweets-colors https://mcp.brandsweets.com/colors/mcp
try this prompt

analyze #1b00a3 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/1b00a3-a79cc4-dfb14e-281f2d-e9ecf1?lock=0&style=vibrant

Want the agent to remember your picks and write them into a living brand? Create a free BrandSweets workspace.

Machine-readable: color.md